document.oncontextmenu = null;
document.body.onpaste = null;
document.body.onselectstart = null;
document.onselectstart = null;
document.ondragstart = null;
document.body.oncut = null;
document.onmousedown = null;
document.body.oncontextmenu = null;
document.body.oncopy = null;
document.body.ondragstart = null;
document.body.onmousedown = null;